Patent GB-774086-A (GB)
Title: Polyamide-polyamate-thickened greases
IPC: C10M119/24
Filed: 1953-07-29
Abstract: A grease composition comprises a lubricating oil thickened to a grease consistency with a compound obtained by the reaction of a dicarboxylic acid with a diamine in which the mol. ratio of acid to amine is greater than 1, reaction of the product with an amine to partially neutralize the terminal carboxyl groups of the product and neutralization of the remaining carboxyl groups with a metal oxide or hydroxide.  The reaction product has the formula <FORM:0774086/IV(a)/1> R and R1 may be (CH2)x, where x is 2-30 for R and 1-52 for R1, or phenylene; R2 and R3 may be a hydrocarbon group, e.g. an aliphatic, alkaryl or aralkyl group having 2-50 carbon atoms, and R3 may also be hydrogen.  M may be a metal, of valency n, of Groups I-IV, z may be 1.5-20. Examples of suitable radicals and metals are given.  The examples refer to greases comprising a solvent-refined naphthenic base oil and the lithium, sodium and calcium salts of the reaction product of hexamethylene diamine and excess adipic acid which had been further reacted with a mixture of n-hexadecylamine, n-octadecylamine and n-octadecenylamine.  The greases may contain 6-50 per cent of the salts.  Lubricating oils referred to are naphthenic base, paraffin base and mixed base oils; other hydrocarbon lubricants, e.g. oils derived from coal products; and synthetic oils, e.g. alkylene polymers, alkylene oxide polymers, dicarboxylic acid esters, liquid esters of phosphorus acids, alkyl benzene polymers and silicon polymers, e.g. silicates and polysiloxanes.  Suitable liquid silicates and polysiloxanes include silicon compounds such as tetraethylsilicate, tetraisopropyl silicate, poly(methylsiloxane) and poly(methylphenylsiloxane). Specifications 774,084 and 774,085, [both in Group IV (b)], are referred to.ALSO:A grease composition comprises a lubricating oil thickened with a compound obtained by the reaction of a dicarboxylic acid with a diamine in which the mol. ratio of acid to amine is greater than 1, reaction of the product with an amine R and R1 may be (CH2)x where x is 2-30 for R and 1-52 for R1, or phenylene; R2 and R3 may be a hydrocarbon group, e.g. an aliphatic, alkaryl or aralkyl group having 2-50 carbon atoms, and R3 may also be hydrogen.  M may be a metal of valency n, of Groups I-IV, z may be 1.5-20.  Examples of suitable radicals and metals are given.  The examples refer to greases to partially neutralize the terminal carboxyl groups of the product, and neutralization of the remaining carboxyl groups with a metal oxide or hydroxide.  The reaction product has the formula: <FORM:0774086/IV(b)/1> comprising a solvent-refined naphthenic base oil and the lithium, sodium and calcium salts of the reaction product of hexamethylene diamine and excess adipic acid which has been further reacted with a mixture of n-hexadecylamine, n-octadecylamine and n-octadecenylamine.  Specifications 774,084 and 774,085 are referred to.ALSO:A grease composition comprises a lubricating oil thickened to a grease consistency with a compound obtained by the reaction of a dicarboxylic acid with a diamine in which the mole ratio of acid to amine is greater than 1, reaction of the product with an amine to partially neutralize the terminal carboxyl groups of the product and neutralization of the remaining carboxyl groups with a metal oxide or hydroxide.  The reaction product has the formula:- <FORM:0774086/III/1> R and R1 may be (CH2)x, where x is 2.30 for R and 1-52 for R1, or phenylene; R2 and R3 may be a hydrocarbon group, e.g. an aliphatic, alkaryl or aralkyl group having 2-50 carbon atoms, and R3 may also be hydrogen.  M may be a metal of valency n of Groups I-IV.  Z may be 1.5/20.  Examples of suitable radicals and metals are given.  The examples refer to greases comprising a solvent-refined naphthenic base oil and the lithium, sodium and calcium salts of the reaction product of hexamethylene diamine and excess adipic acid which had been further reacted with a mixture of nhexadecylamine, noctadecylamine and noctadecenylamine.  The greases may contain 6-50 per cent of the salts.  Lubricating oils referred to are naphthenic base, paraffin base and mixed base oils; other hydrocarbon lubricants, e.g. oils derived from coal products; and synthetic oils, e.g. alkylene polymers, alkylene oxide polymers, dicarboxylic acid esters, liquid esters of phosphorus acids, alkyl benzene polymers and silicon polymers, e.g. silicates and polysiloxanes. of suitable oils are given.  Specifications 774,084 and 774,085 are referred to.